MTS AHX800 High Elongation Extensometer - Manual (Page 17)

Setting up a Test
AHX800 High Elongation Extensometer Product Manual Operation 17
4. Adjust the contact to the specimen.
The amount of clamping force on the specimen can be adjusted with the
knurled knobs of the upper and lower arm. This step must be done after the
specimen is installed. The clamping force should be adjusted when the
specimen type is changed.
Displacement limits on your test system can restrict the actuator movement
to a specified range.
Failure to establish upper and lower limits can damage the extensometer.
After adjusting the extensometer's contact with the specimen, you must adjust the
lower safety switch. The upper and lower switches control the crosshead
displacement at the end of a test according to the finger position.
WARNING